My probably final comments before I leave for the shores of southern France...
...because the elongated basisphenoid is probably -- I don't know -- present in every elongated braincase, which may IMHO easily evolve more often than once; the forked posterior end of the premaxilla is surely not something that won't evolve twice either, I think (again, I don't know). Also, that it shares these characters with Syntarsus but -- apparently -- not with the very similar Coelophysis is, if true, striking.
This "statement" was based on the usually assumed similarities between Deltadromeus and Dryptosaurus.
HP Rob Gay answered to this:
> Wait and see, coelophysoids are actually the closest ancestor to
> birds...oy...someone help, it's getting late.
Raath 1977 or so, IIRC, had proposed this, based AFAIK largely on things like fusion in the hip region and other convergences.